Gem Tree
A gem tree is a rare type of tree introduced in version 1.6.
Appearance
Although colored similarly to the gem type they pair with, a gem tree otherwise resembles a very large tree. They tend to have leaves arranged in broad, shallow patterns different from other tree types.
Particles descend from gem tree leaves, suggestive of falling petals.
Regardless of the type of tree, all gem trees glow blue in the dark.
Where Found
Gem trees only spawn during world generation (or in unrevealed areas of older worlds opened in 1.6) on marble floating islands. They do not grow larger and cannot be planted or relocated.
Each gem tree will produce the gem of the tree type. These will spawn every eight years (32 game days), with the usual options to speed things up. These gems can be harvested by hand or by having a blockhead pass through the space they're in.
Tree branches can be harvested for sticks and trunks for wood. However, the trees will not regrow. If the tree is cut down, gems may also fall.
Types
Amethyst Tree
Amethyst trees are the most common type of gem tree and spawn amethysts. They have purple coloring.
Sapphire Tree
Sapphire trees are the second most common type of gem tree and spawn sapphires. They have blue coloring.
Emerald Tree
Emerald trees are the third most common type of gem tree and spawn emeralds. They have green coloring.
Ruby Tree
Ruby trees are the second least common type of gem tree and spawn rubies. They have red coloring.
Diamond Tree
Diamond trees are the least common type of gem tree and spawn diamonds. They have light blue coloring.